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Help needed. Anyone have Idea why my dads 2009 brute force 750 fouls plugs after a short time of usage? The machine has VERY low hours, and has never been mudded or abused. When it started running rough, I pulled the front engine plug and it was black. I replaced it and it started right up and ran awesome. I figured I'd replace the other one to at the same time which I did. That one was a PIA LOL. Machine ran great for about a month or so. Now it's doing it again. I pulled the front plug again yesterday for him and it was black and oily. Do you think the ignition coil that's hooked to that cylinder is bad? Bad wire maybe? He barely rides the machine as he uses it on the farm.Any help would be great!
He runs non oxy gas in it also. Air filter is clean and doesn't burn or smoke any oil.
 

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Help needed. Anyone have Idea why my dads 2009 brute force 750 fouls plugs after a short time of usage? The machine has VERY low hours, and has never been mudded or abused. When it started running rough, I pulled the front engine plug and it was black. I replaced it and it started right up and ran awesome. I figured I'd replace the other one to at the same time which I did. That one was a PIA LOL. Machine ran great for about a month or so. Now it's doing it again. I pulled the front plug again yesterday for him and it was black and oily. Do you think the ignition coil that's hooked to that cylinder is bad? Bad wire maybe? He barely rides the machine as he uses it on the farm.Any help would be great!
He runs non oxy gas in it also. Air filter is clean and doesn't burn or smoke any oil.
Normally I would say its showing signs that the engine is in need of a rebuild. However you say it is NOT using engine oil, only that the plugs are fouling with oil..not fuel. The only other things that can do that are: 1-Oil is being introduced through the crankcase vent. Check the oil level-ensure it is not over the top hash mark then pull the air filter , frame and fire guard and see if there is any sign that oil left a path from the vent port to the intake. Then 2- the only other thing that can look oily on a plug is coolant. Many Brutes have been known to loose head gaskets, letting coolant into the cylinder...but not usually both. Check the coolant recovery bottle-is it loosing any?



Other things to check are low power or bad battery/charging system. Then if an injector is sticking or leaking.
 

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Thanks for the quick reply! I will check those out. One other thing, I did the spark plug mod a while back where you replace the plug wires with ones without a resistor. I wonder if that might be causing it over time. Was going to put the original ones back on also and see it it changes anything. I know the coolant reservoir was fine and the oil is between the hash marks. Its get an oil change every year which I do for him.
 

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The resistor system is there for more then just noise suppression in stereos so may be a good idea to put it back. Some have reported odd things happening to their coils after doing that mod and ended up replacing the coils. Not everyone though.
 
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